Swivel chair



FIG. 1 is a perspective view of the swivel chair, showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view, the other side being a mirror image;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a top plan view. 

The ornamental design for a swivel chair, as shown and described. 